Scientists at Connecticut’s public health laboratory say they’ve discovered a flaw in a manufacturer’s testing system for the coronavirus that’s used by labs around the country. So far, it’s resulted in 90 people — mostly residents of Connecticut nursing homes and assisted living facilities — recently receiving false positive tests.

State public health officials are now reviewing whether nursing home residents who received false positive tests were grouped with other residents with accurate positive tests, given the state’s recommendation to cohort nursing home residents who test positive for COVID-19.

"We don’t know that yet," said Josh Geballe, Gov. Ned Lamont’s chief operating officer, noting that a team from the state’s Department of Public Health has been reaching out to every clinician responsible for those individuals, as well as the facilities where they live, and compiling data on the situation.

Meanwhile, Dr. Deidre S. Gifford, the state’s acting public health commissioner, said her agency is also reaching out to labs throughout the state to see how many of them use the testing platform manufactured by Thermo Fisher Scientific.